Implement -flipBlack in XBoard

When -flipBlack is true, the white and back piece pixmaps are swapped in
flipView. The idea is that the black pieces are upside-down versions of
the white (Shogi) pieces, so that swapping white and black in effect
turns all pieces upside down, which is what should happen in flipView.

diff --git a/xboard.c b/xboard.c
index dc99bd3..d9f382a 100644 (file)
--- a/xboard.c
+++ b/xboard.c
@@ -4215,6 +4215,7 @@ static void colorDrawPieceImage(piece, square_color, x, y, dest)
        }
        break;
     }
+    if(appData.upsideDown && flipView) kind ^= 2; // swap white and black pieces
     XCopyArea(xDisplay, xpmPieceBitmap[kind][piece],
              dest, wlPieceGC, 0, 0,
              squareSize, squareSize, x, y);
@@ -8742,6 +8743,7 @@ OverlayPiece(piece, clip, outline,  dest)
       kind = 0;
     else
       kind = 2;
+    if(appData.upsideDown && flipView) kind ^= 2;
     XCopyArea(xDisplay, xpmPieceBitmap[kind][piece],
              dest, clip,
              0, 0, squareSize, squareSize,